| /* |
| * Copyright 2015 Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onosproject.openstackswitching; |
| |
| import org.onlab.packet.ARP; |
| import org.onlab.packet.Ethernet; |
| import org.onlab.packet.Ip4Address; |
| import org.onlab.packet.MacAddress; |
| import org.onosproject.net.flow.DefaultTrafficTreatment; |
| import org.onosproject.net.flow.TrafficTreatment; |
| import org.onosproject.net.packet.DefaultOutboundPacket; |
| import org.onosproject.net.packet.InboundPacket; |
| import org.onosproject.net.packet.OutboundPacket; |
| import org.onosproject.net.packet.PacketService; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import java.nio.ByteBuffer; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * Handles ARP packet from VMs. |
| */ |
| public class OpenstackArpHandler { |
| |
| private static Logger log = LoggerFactory |
| .getLogger(OpenstackArpHandler.class); |
| private PacketService packetService; |
| private OpenstackRestHandler restHandler; |
| |
| /** |
| * Returns OpenstackArpHandler reference. |
| * |
| * @param restHandler rest API handler reference |
| * @param packetService PacketService reference |
| */ |
| public OpenstackArpHandler(OpenstackRestHandler restHandler, PacketService packetService) { |
| this.restHandler = checkNotNull(restHandler); |
| this.packetService = packetService; |
| } |
| |
| /** |
| * Processes ARP packets. |
| * |
| * @param pkt ARP request packet |
| */ |
| public void processPacketIn(InboundPacket pkt) { |
| Ethernet ethernet = pkt.parsed(); |
| ARP arp = (ARP) ethernet.getPayload(); |
| |
| if (arp.getOpCode() == ARP.OP_REQUEST) { |
| byte[] srcMacAddress = arp.getSenderHardwareAddress(); |
| byte[] srcIPAddress = arp.getSenderProtocolAddress(); |
| byte[] dstIPAddress = arp.getTargetProtocolAddress(); |
| |
| //Searches the Dst MAC Address based on openstackPortMap |
| MacAddress macAddress = null; |
| |
| OpenstackPort openstackPort = restHandler.getPorts().stream(). |
| filter(e -> e.fixedIps().containsValue(Ip4Address.valueOf( |
| dstIPAddress))).findAny().orElse(null); |
| |
| if (openstackPort != null) { |
| macAddress = openstackPort.macAddress(); |
| log.debug("Found MACAddress: {}", macAddress.toString()); |
| } else { |
| return; |
| } |
| |
| //Creates a response packet |
| ARP arpReply = new ARP(); |
| arpReply.setOpCode(ARP.OP_REPLY) |
| .setHardwareAddressLength(arp.getHardwareAddressLength()) |
| .setHardwareType(arp.getHardwareType()) |
| .setProtocolAddressLength(arp.getProtocolAddressLength()) |
| .setProtocolType(arp.getProtocolType()) |
| .setSenderHardwareAddress(macAddress.toBytes()) |
| .setSenderProtocolAddress(dstIPAddress) |
| .setTargetHardwareAddress(srcMacAddress) |
| .setTargetProtocolAddress(srcIPAddress); |
| |
| //Sends a response packet |
| ethernet.setDestinationMACAddress(srcMacAddress) |
| .setSourceMACAddress(macAddress) |
| .setEtherType(Ethernet.TYPE_ARP) |
| .setPayload(arpReply); |
| |
| TrafficTreatment.Builder builder = DefaultTrafficTreatment.builder(); |
| builder.setOutput(pkt.receivedFrom().port()); |
| OutboundPacket packet = new DefaultOutboundPacket(pkt.receivedFrom().deviceId(), |
| builder.build(), ByteBuffer.wrap(ethernet.serialize())); |
| packetService.emit(packet); |
| } |
| } |
| } |